【多选题】用显微镜时,需要注意的是( )
B.
避免与酸、碱和易挥发、腐蚀性的化学试剂放在一起
C.
物镜和目镜必须保持清洁,如有灰尘应用擦镜纸擦拭,不要用布或其他物品擦拭
D.
用油镜观察后,应先用擦镜纸将镜头上的油擦去,再用蘸有少许二甲苯的擦镜纸擦拭2-3次,最后用干净的擦镜纸将二甲苯擦去
【多选题】题干:显微镜的物镜和目镜必须保持清洁,如有灰尘不要用( )擦拭。
【简答题】2) ___________ upon me
【多选题】使用显微镜时,需要注意的是
B.
避免与酸、碱和易挥发、腐蚀性的化学试剂放在一起
C.
物镜和目镜必须保持清洁,如有灰尘应用擦镜纸擦拭,不要用布或其他物品擦拭
D.
用油镜观察后,应先用擦镜纸将镜头上的油擦去,再用蘸有少许二甲苯的擦镜纸擦拭2-3次,最后用干净的擦镜纸将二甲苯擦去
【单选题】C2-Classifying a cost as either direct or indirect depends upon:
A.
the behavior of the cost in response to volume changes
B.
whether the cost is expensed in the period in which it is incurred
C.
whether the cost can be easily identified with the cost object
D.
whether an expenditure is avoidable or not in the future
【单选题】2单选Upon cooling, normally semicrystalline polymers will suffer the following process:
A.
Liqiud-Viscous liquid-Rubbery-Glass transition-Glassy state
B.
Liqiud-Viscous liquid-Crystallites in a rubbery matrix- Crystallites in glassy matrix
C.
Glassy state-Glass transition- Rubbery-Viscous liquid-Rubbery- Liqiud
D.
Liqiud-Crystallites in glassy matrix -Crystallites in a rubbery matrix- -Viscous liquid
【判断题】打开“移动变换输入”对话框的方法为鼠标右键单击移动工具( )。